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R. P. JOHNSON 811 E. J. SUMMER.

LUMBER DRIER.

No.79,661. 1 Patented Julyv; 1868.

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' RICHARD P. JOHNSON AND ELI-J. SUMNER, OF'WABASH, INDIANA.

Letters Patent No. 79,661, dated July 7, 1863.

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TO ALL WHOM IT MAY cononnm Be itknown that we, Riemann P. Jouusox and En J. SUMNER, of Wabash, Wabash county, Indiana, have invented a new and useful improvement on the machine and method of. themselves, said JOHNSON and SUMNER, being An Improvement in Apparatus forDrying Lumber, secured by Letters Patent, No. 66,594, and dated on the 9th day of July 186'Z; and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference beingha'd to the annexed drawings, fig. 1 and fig. 2, making a part of this specification, in'which Figure 1 is an interior vertical longitudinal section, and in which Figure 2 is a vertical cross-section of .the same Similar-letters of reference indicating corresponding parts. This invention relates to and is supplemental to our foregoing invention, referred to, and is intended to become apart of the same, and consists of modifications and improvements of it in the following particuv lars, to wit: I,

First, in constructing our furnace in two chambers, which are represented by the fiucs A and B, one directly above the other, the upper-one, A, immediately below the steam-pans b b b, and the under one, 13, directly under that, and'separuted from it by a horizontal partit1on,'D,extending backward beyond the steam-pans, where the two flues, A and B, are then united at the point Gr, and the current of draught is then continued along the arrowline e e c e, until the hot air, having first passed through the large flue F F and the dry-chamber 0 0 O, escapes by the mouth G through the chimneys H H.

Second, in placing the escape of the chimney H H in thedryingchamber, near the floor, at the point (3,

Third, in suspending a curtain of leather, woollen cloth, metal, or oth-er,not easily-combustible material from the stanchions, m 'm m, of the'car loaded with lumber, by the hooks a a a, so as to fill and fit closely into the upper part and sides of the drying-chamber, but not so as to obstruct the movement of thc cars back and forth in the drying-chamber; how low the curtain to be suspended, to depend on the size and condition of the l umbeiynnd the circumstances of the heat and velocity of the air, as occasion may require.

By these means, the following results are gained, to wit:

First. By the-use of the double furnace, by firing in the flue A, steam can be generated in the steamingpans b b b b when required, while the heated air from that flue is carried along the arrow-line c c c 6 into the drying-room O O Q, or, if not required, by firing in the flue 13, hot air only can be created; and, in either case, cold air will be admitted by the drought through the other line, which, by its oxygen, will at once complete the combustion of all the sparks from the burning-flue, and obviate all danger of burning the lumber; at the same time, by dampers, the temperature can be moderated to any degree required. I I

Second. By the curtain K K, the hot air, which would otherwise rise to the ceiling of tho drying-room, by

its greatcrlevity,'is thus forced to pass under the curtain, and maintain the same temperature near the floor of the drying-room as at tho.top.

Third. By placing the mouth of the chimney near the floor, at C, as the current of escaping air is directed along and near the floor of tho drying-room, instead of at the ceiling above.

We claim as new, in connection with our lumber-drying apparatus, and desire to secure by Letters Patent 1. The double furnace A and B, separated by a horizontal partition, and provided with a com nion escape-flue, in the manner and for-the purposes set forth.

2. The providing the cars with curtains, or like device, in the manner and for the purposes as set forth.

RICHARD I. JOHNSON,

ELI J. SUMNER. Witnesses:

W. I. JENKINS, ELI J. NEWTON. 

